Bug 21346: Streamline logic in holds and transfers

Bug 21346: Streamline logic in holds and transfers

1) Replaced comparison with string to make testing branch easier.
2) Replaced useless 0 values with undef.

Does not change any behavior, only simplifies code.

Signed-off-by: Lisette <lisetteslatah@gmail.com>
Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 48787acc6f725686583bb05f45888acf3e1231d0)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>